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D. M. THOMPSON. STEAM GENERATOR.

No. 601,487. PatentedMar. 29,1898.

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D. M. THOMPSON.

STEAM GENERATOR. No. 601,487. Patented Mar. 29,1898.

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ATENT uric.

DAVID M. THOMPSON, OF PROVIDENCE, RHODE ISLAND.

STEAM-GENERATOR.

SPECIFICATION forming part of Letters Patent No. 601,487, dated March29, 1898.

Application filed July 23, 1897. Serial No. 645,711. (No model.)

To all whom it may concern.-

Be it known that 1 DAVID M. THOMPSON, of Providence, in the county ofProvidence and State of Rhode Island, have invented a new and usefulImprovementin Steam-Generators and I hereby declare that the followingis a full, clear, and exact description of the same, reference being hadto the accompanying drawings, forming part of this specification.

The invention has reference to an improvement in steam-boilers andfurnaces therefor.

The invention consists in the peculiar and novel construction of thesteam-boiler, the Water-tube circulating attachment, and the furnace,whereby the more perfect combustion of the fuel in the furnace issecured, the circulation of the water increased, the separation of thesteam facilitated,and better economic results secured, as will be morefully set forth hereinafter.

One object of the invention is to secure the more perfect combustion ofthe fuel and prevent the discharge of black smoke;

Another object of the invention is to separate impurities contained inthe water and collect the same below the parts exposed to the action ofthe fire.

Another object of the invention is to secure the rapid circulation ofthe water and facilitate the separation of the steam from the water.

Another object of the invention is to facilitate the separation of sootand ashes from the products of combustion to prevent the clogging of thevertical tubes; and a further object of the invention is to reduce theheight of the vertical tubular boiler Without impairing its efficiency.

In steam generators as heretofore constructed, and particularly in thetype known in the arts as vertical tubular boilers, the furnace wasplaced below the vertical tubular boiler and the products of combustioni'mpinged on the boiler and passed from the fire upward through thevertical tubes, the volatile gases, with the unconsumed carbon, soot,ashes, and vapor, coming in contact with the surface of the boiler, andthe tubes were chilled by the comparative low temperature of the boilerand adhered to the interior surthat the products of combustion from onefurnace will pass over the fire of the other furnace and then into alarge combustion-chamber, from which they pass down under the ver ticaltubular boiler and upward through the tubes of the same to the uptake,or they may surround the lower part of the vertical tubular boiler and,descending, enter the tubes, to be carried to the uptake and chimney. Toutilize the radiated heat in these furnaces, I extend a series ofwater-tubes through the same.

Figure 1 is a vertical section showing the relations of the furnaces,the water-tubes, and the vertical steam-boiler to each other. Fig. 2 isa vertical transverse section on the line X X of Fig. 1, looking towardthe front of the steam generator. Fig. 3 is a vertical transversesectional view showing the two f urnaces, the combustion-chamber, andthe water-tubes.

Similar marks of reference indicate corresponding parts in all thefigures.

In the drawings, A indicates the furnace on the left-hand side of thesteam generator, which, as shown in the drawings, is the furnace towhich the fuel has been last supplied; A,t-he furnace on the right-handside,in which the fire has given up its volatile gases, so that a brightfire burns on the grate; A an arched opening connecting the rear ends ofthe furnaces; A a swing-gate controlling the front connections betweenthe furnaces A and A 5 an ash-pit door A and a firing-door A Thefurnaces and the combustion-chamber may be inclosed, and in thepreferred form to connect the adjoining cells.

are inclosed, by the cellular casing A consisting of a series of hollowsections divided by vertical partitions pierced with openings Theseveral sections are connected by the pipes A A, and water is suppliedto the cellular casing, to be heated and conducted from the casing to atank or pump, to be delivered to the boiler. The vertical tubular boilerB has its lower tube-sheet at or nearly at a level with thegrate-surface of the furnaces, and the combustion-chamberA connects withthe flamechamber A under the tubular boiler, by the drop-flue A Thetransverse wall, supported on the arch A and the wall A prevents directaccess to the shell of the vertical tubular boiler in the form shown inthe drawings; but this construction may be modified so as to leave anopen space around the lower part of the vertical boiler B, closed in ata point below the water-level in the boiler, a method well known andgenerally practiced in steamboiler construction.

The vertical tubular boiler B is provided with the horizontal cylinder13, extending through the combustion-chamber A to the front. The pipe 13extends from the cylinder B downward through the drop-flue A to themud-drum B and within the pipe 13* is placed a pipe surmounted with thescumcollector B The front end of the cylinder B is provided with thehead-fitting B and is connected by the pipe 13, extending diagonally oneach side, with the manifolds B B and these manifolds are connected bythe pipes B B with the manifolds B B The water-tubes 13 13 extend fromthe manifolds B B to the manifolds B 13 and from these the water-tubes BB extend downward to the manifolds B B each connected with a mud-trap BFrom the manifolds B B extend the watertubes B B through the length ofthe furnaces A and A. The portions of these water-tubes beyond thebridge-wall are bent and connect, by means of the tubes B B with themanifolds B B ,connected each by means of a suitable connecting-pipewith the manifolds B B and these manifolds B 13 are connected by thepipes B with the mud-drum B secured to the lower end of the cylinder 13extending downward from the central portion of the lower tube-sheet ofthe vertical tubular boiler B. The feed-water is supplied to thesteam-generator through the pipe 13 which extends through the centralportion of the vertical tubular boiler B and through thecirculating-tube B in the cylindrical projection 13 and ends in aconical nozzle or other suitable distributer within the muddrum B sionsas will enable a person to enter and make any required inspection orrepairs. The manifolds B B maybe conveniently reached by removing thesection G which is disconnected from the cellular casing A The manifoldsB and B are reached by opening the door C over the fire-doors A A in thefront of the generator. The manifolds are provided with the usualhand-hole covers opposite each of the water-tubes.

To enable others skilled in the art to use my invention, I will describethe operation of the same more fully.

Before lighting the fire in the improved steam-generator the boiler isto be filled with water until the horizontal cylinder B is at least halffull, and the water-line is maintained above the horizontal center ofthe cylinder B. The fire is first lighted in one of the two furnaces Aor A, and the products of combustion are passed through the other fur--nace into the combustion-chamber and from this through the drop-flueand the tubes of the vertical boiler to the chimney. As soon as the fireburns brightly the firing and ashpit doors of this furnace are closed,the other furnace is lighted, and the smoke and gases of this furnaceare made to pass by the adjustment of the gate A through the opening Aand over the fire of the first furnace. This alternate firing of onefurnace after the other and the passing of the products of com bustionof one furnace over the incandescent fire in the other furnace iscontinued. WVhen the brickwork has been thoroughly-heated, the archesover the furnace that is being supplied with fuel greatly facilitate thecombustion of the fuel and the combustion of the volatile gasesdisengaged by the combustion of the fuel. These gases pass from thefurnacein which they are generated through the arched opening A into theother furnace, in which a bright incandescent fire is burning and thearch of which is highly heated. The gases are by this passage from onefurnace to the other thoroughly mixed, while they are maintained at thehigh temperature required for combustion. In this condition the gasespass upward into the combustion-chamber A", the cross-sectional area ofwhich is about three times the cross-sectional area of the furnace. Thegases expand and, being surrounded by the heated brickwork, arethoroughly consumed. The heated products of combustion descend to theflame-chamber A and pass upward through the tubes of the verticaltubular boiler to the uptake and chimney. Neither soot nor smoke entersthe tubes of the boiler, and the fine ashes usually carried into thetubes are precipitated in the combustion-chamber and flame-chamber,owing to their great cross-sectional area and slower movement ofthegases.

The water heated in the cellular casing under atmospheric pressure bythe heat carried through the brickwork into the casing is IIO heatedthrough the manifolds B 3 B B an d the connecting-pipes into the frontend of the horizontal cylinder B, where the liberation B and carried tothe mud-drum B of the steam is facilitated by the extended Iwater-surface, the level of which is maintained by the connection of thehorizontal cylinder with the vertical steam-boiler B and the pipe Bthrough which the surplus water is conveyed to the mud-drum B the lowerend of which is connected by a large pipe with the mud-drum B under thevertical steam-boiler B, thereby securing the rapid circulation of thewater through the watertubes, the liberation of the steam, and themaintenance of a reliable Water-level. The impurities are gathered bythe scum-collector A portion of the water ascends from the manifolds B Bthrough the vertical water-tubes B B to the manifolds B and thencethrough V the water-tubes 13 to the manifolds B and enters the front endof the horizontal cylinder B, where the steam is separated from thewater, the water-level maintained, and the rapid circulation of thewater secured in the manner above described with reference to thewater-tubes B Circulation of the water is maintained in the verticaltubular steamboiler B by means of the circulating-tube H, the annularspace forming ascending curren ts,while the descending currents passdown the tube 13 to the mud-drum. The horizontal cylinder B has largesteam and water connections with the boiler B. The steam generatedpasses freely to the boiler and the large body of water in the boilermaintains the normal water-level in the horizontal cylinder, althoughthe same is exposed to the first action of the heat.

Having thus described my invention, I claim as new and desire to secureby Letters Patent- 1. In a steam-generator, the combination with thevertical tubular steam-boiler, of two furnaces placed side by side, saidfurnaces extending above the lower end of the tubular boiler, brickworkinclosing the furnaces,

ed so as to be alternately fired, a combustion-- chamber above thefurnaces, a cylinder connected with the tubular boiler at the waterlineand extending through the combustionchamber, and a flue connecting thecombustion-chamber with the space under the tubular boiler; whereby thefuel is consumed in brick-inclosed furnaces, soot and ashes are retainedand the heat is made to enter the tubes of the vertical boiler, asdescribed.

3. In a steam-generator, the combination with the vertical tubularsteam-boiler, the horizontal cylindrical extension and the furnaces, ofthe series of water-tubes B B and B connected with the boiler below thefurnaces and with the horizontal cylinder, whereby the circulation ofthe water in the boiler, the water-tubes and the horizontal cylinder andthe separation of the steam are facilitated.

4. 111 a steam-generator, the combination with two furnaces placed sideby side andconnected, as described, so that they may be alternatelyfired, a combustion-chamber above the furnaces, said furnaces andcombustion-chamber inclosed in brickwork, a vertical tubular boilerlocated in the rear of the furnaces, the tube-sheet of which is belowthe normal level of the fuel in the furnaces, a flame-chamber below thevertical tubular boiler, a drop-flue connecting the combustion-chamberwith the flame-chamber, and a cellular casing, inclosing the furnaceportion of the steam-generator, provided with watersupply and connectingpipes, whereby the part of the heat held back in the combustionchamberand transmitted through the brickwork is utilized to heat thefeed-water, as described.

5. In a steam-generator, the combination with the vertical tubularboiler B, the Vertical cylindrical extension B the circulatingtube B andthe mud-drum B of the horizontal cylinder B connected with the verticalboiler at the normal water-line, the tube B the mud-drum B connectionsbetween the mud-drums B and B furnaces located on one side of thevertical boiler having the IIO grate practically on a level with thelower end of the vertical boiler, and fines for conveying the productsof combustion downward under the vertical tubular boiler, whereby thecirculation of the water and the liberation of the steam arefacilitated, as described.

6. In a steam-generator, the combination with the vertical tubularboiler 13, the horizontal extension B, the vertical cylindricalextension B the circulating-tube B, the mud-drum B, the vertical tube Bthe muddrum B and connection between the muddrums B and B of themanifolds B and B connected with the mud-drum B, the

manifolds 13 B and B the water-tubes B connecting the manifolds Bthrough the pipes B with the manifolds B, the water-tubes B and Bconnecting the manifolds B", B

and B ,'connections between the manifolds B and the fitting B at thefront end of the I In Witness whereof I have hereunto set my cylinder B,the furnaces A and A, the comhand.

bastion-chamber A the drop-flue A conr necting the combustion-chamberwith the THOMPSON 5 flame-chamber A and the souterrain O, Witnesses:

whereby access is had to the connections be- JOSEPH A. MILLER,

low the floor-level, as described. l JOSEPH A. MILLER, Jr.

